PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2981Pyrometer,indicating

Alnor Instrument Company · NSN 6685-00-526-6649 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-526-6649 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-526-6649. Primary manufacturer part number: 2981.
Features
  • Pyrometer,indicating — FSC 6685
  • Case Type: DUSTPROOF AND MOISTURE PROOF
  • Scale Smallest Increment: 20.0 DEG FAHRENHEIT
  • Material: ALUMINUM ALLOY METER CASE
  • Measurement Type: MILLIVOLT CIRCUIT
  • Scale Type: DRUM
  • Scale Calibration: CALIBRATED TO GLOWING FILAMENT
  • Scale Length: 3.500 INCHES NOMINAL IN
Applications
  • Applications requiring Aluminum Alloy Meter Case construction
General Description

The Pyrometer,indicating, cataloged under National Stock Number 6685-00-526-6649, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Alnor Instrument Company. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-526-6649
Primary Part Number2981
Item NamePyrometer,indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerAlnor Instrument Company
StatusACTIVE
Case TypeDUSTPROOF AND MOISTURE PROOF
Scale Smallest Increment20.0 DEG FAHRENHEIT
MaterialALUMINUM ALLOY METER CASE
Measurement TypeMILLIVOLT CIRCUIT
Scale TypeDRUM
Scale CalibrationCALIBRATED TO GLOWING FILAMENT
Scale Length3.500 INCHES NOMINAL IN
Pointer/pen Type and Quantity1 INDICATING SINGLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4920-00-167-0128 INTERCHANGEABLE
Fixture,aircraft Maintenance
5210-00-167-0131 INTERCHANGEABLE
Gage,indicating,internal
3120-00-354-3790645162 INTERCHANGEABLE
Bearing Half Set,sleeve
Am General Llc
4520-00-386-37742-9-88 INTERCHANGEABLE
Valve,drip
W1d1 Natick Soldier Center Dba Us Army Ccdc Soldier Center Div Combat Capabilities Development Command - Soldier Center
5307-00-413-04622988 INTERCHANGEABLE
Stud,mounting
Meggitt (orange County), Inc.
5935-00-502-76082988 INTERCHANGEABLE
Connector,receptacle,electrical
General Electric Company
2915-00-613-5189 INTERCHANGEABLE
Seal
3040-00-630-87312988 INTERCHANGEABLE
Shaft,drive,with Worm
Lubriquip Inc Dba Lubriquip, Inc., a Unit of Idex
5950-00-803-9687618650 INTERCHANGEABLE
Transformer Assembly
Honeywell International Inc. Dba Honeywell International
2940-01-018-48731P7360 INTERCHANGEABLE
Filter Element,intake Air Cleane
Caterpillar Inc Div Caterpillar Defense
Cross-Reference Index
Part NumberManufacturer
2981 PRIMARY Alnor Instrument Company (USA)
2988 Alnor Instrument Company (USA)
Related Parts
4920-00-167-0128INTERCHANGEABLE
FIXTURE,AIRCRAFT MAINTENANCE
5210-00-167-0131INTERCHANGEABLE
GAGE,INDICATING,INTERNAL
3120-00-354-3790INTERCHANGEABLE
BEARING HALF SET,SLEEVE
645162
4520-00-386-3774INTERCHANGEABLE
VALVE,DRIP
2-9-88
5307-00-413-0462INTERCHANGEABLE
STUD,MOUNTING
2988
5935-00-502-7608INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
2988
2915-00-613-5189INTERCHANGEABLE
SEAL
3040-00-630-8731INTERCHANGEABLE
SHAFT,DRIVE,WITH WORM
2988
5950-00-803-9687INTERCHANGEABLE
TRANSFORMER ASSEMBLY
618650
2940-01-018-4873INTERCHANGEABLE
FILTER ELEMENT,INTAKE AIR CLEANE
1P7360
5342-01-109-9048INTERCHANGEABLE
BRACKET
2988
4820-01-238-6295INTERCHANGEABLE
DIAPHRAGM,ACTUATOR VALVE,SPECIAL
2981

Frequently Asked Questions

What is NSN 6685-00-526-6649?

NSN 6685-00-526-6649 is a Pyrometer,indicating, manufactured by Alnor Instrument Company, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-526-6649?

NSN 6685-00-526-6649 has 2 cross-referenced part numbers: 2981 (Alnor Instrument Company), 2988 (Alnor Instrument Company).

What NSN replaces 6685-00-526-6649?

There are 12 known substitutes for 6685-00-526-6649: 4920-00-167-0128, 5210-00-167-0131, 3120-00-354-3790 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2981?

Key specifications for 2981: Case Type: DUSTPROOF AND MOISTURE PROOF; Scale Smallest Increment: 20.0 DEG FAHRENHEIT; Material: ALUMINUM ALLOY METER CASE; Measurement Type: MILLIVOLT CIRCUIT. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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